Development of a Uricase-Free Colorimetric Biosensor for Uric Acid Based on PPy-Coated Polyoxometalate-Encapsulated Fourfold Helical Metal-Organic Frameworks.

Developing a new cost-effective and reliable approach used for the detection of uric acid (UA) with no requirement of uricase is still very challenging. Herein, an easily realized, cost-effective, and uricase-free approach is reported for selective colorimetric biosensing of UA utilizing polypyrrole (PPy)-coated polyoxometalate-encapsulated fourfold helical metal-organic frameworks Ag[bimt][PMoO]·2HO (AgPMo) as a monolithic peroxidase mimic. It is demonstrated that the as-obtained AgPMo@PPy possesses excellent peroxidase-like activity originated from the synergistic effect to induce catalytic oxidation of colorless 3,3',5,5'-tetramethylbenzidine (TMB) to green oxTMB in the presence of HO.

Solvochromic and photodimerization behaviour of 1D coordination polymer via single-crystal-to-single-crystal transformation.

The coordination polymer [Zn(2)(1,2-bda)(2)(bpe)]·MeOH, which exhibits solvochromic effects upon reversible linear alcohol removal and adsorption, can be turned into [Zn(2)(1,2-bda)(2)(tpcb)(0.5)] in two-step SCSC transformations.